I regularly use mine to recover on shallow rock strewn beaches. As long as you judge it right once the bow is in between the two sets of rear rollers its easy to power the back round to straighten up and then a quick burst of power gets it onto the trailer. I just make sure that the trailer is deep enough in the first place.

Once I am almost all the way on I leave a little bit of power on then go up front and clip on the winch. Power off, engine up and winch on.

Done !

I'm with Chris on this one, always recover by myself, and I cannot remember ever having an issue. Same technique as Chris. Loads of rollers on my Rapide trailer (38) and no keel rollers. The rear most rollers give a wide enough target and once in contact self centre the boat nicely. I'd have to be wildly off target to damage the hull - there, fate has been tempted
One small admission, I normally recover on the Lymington River, a pretty benign area!!

In the example wear baldy bangs his head on youtube, did he use the winch to pull the boat off or was that just the winch spooling out under gravity?

Didn't get the idea of that second off last line he clipped on, if had broke loose it would have slid off at least a metre probably two. I have seen a bottle screw used for his last connection. We take a few turns around the winch post with the painter as a supplemental line.

You can get anal though - second winch post (in case first gives way)
Multiple D rings on keel - I ve seen it probably weakened it more than strengthened.

The winch 'powers out'. I think if the trailer is working correctly, very little effort should be necessary to move the boat on it?. The benefit here to powering out, is you can be in the boat while doing it and still be in control.

If you mean the second dyneema line, I didn't copy that bit, I understood that to be a means of auto stopping the winch so as not to pull the bow eye out the boat....thought it was a bit of overkill. If you read other threads here, people talk about "the winch struggles" (similar power to mine 4500lb ) after using the system for 6 months, I think some form of auto stop is desirable...I'd fitted a 500kg hook as a safety 'break'...one inadvertent press of the in button with bow up against the snubber and it straightened this hook.

If you’re meaning the chain connection to the post; the winch isn't designed to take shock loads (bumps on the road) the Wichard connection is fast and safe so is easy to connect before you pull up the slip.

Yip I've got two external lifting eyes which are also used to lash down for trailering...

Stoo the problem is with this trailer and other similar layouts, if you F it up and miss the rollers, you run the hull up on the metal part of the trailer.

Well there is that consideration... My hull is quite deep and I actually had to have the bunk supports lengthened to make sure the keel was well clear of the metal cross bars on the trailer. I have two bunks on either side and a the gap between them nicely cradles a chine on the hull, which helps keep everything straight. A blind man could put my boat on the trailer now.